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US 4,143,425 AGranted
Left atrial to descending thoracic aorta left ventricular assist device
OwnerThomas M. Rungeinventor
Life of this patent
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OwnerThomas M. Rungeinventor
Estimating the term…
An implanted tether-free externally powered motor with suitable reduction gearing drives a spirally grooved shaft having a ring housing for a shaft follower pin. A rectangular cross section chamber receives an ejection plate pivoted near one end to a first leg of the ring housing and having a resilient lost motion connection with a second leg of the ring housing near its other end. A compressible sac or pouch extends through said chamber and is fitted at its opposite ends with porcine valves and has conduit extensions outwardly of said valves for connection with the left atrium and the descending thoracic aorta, respectively. During use, the sac or pouch is cyclically compressed by the ejection plate, initially at the end of the ejection plate having the lost motion yielding connection with the follower ring housing, and subsequently at both ends of the ejection plate so that a predetermined volume of blood is delivered on each stroke of the ejection plate to the thoracic aorta.
A cardiac assist device comprising a substantially rigid compression chamber having opposite end openings, a compressible pouch extending longitudinally through said compression chamber and adapted for connection outside of said chamber with cardiac circulatory elements, check valve means in opposite end portions of said pouch, an ejection plate in said compression chamber on one side of the pouch, and a power drive means connected with said ejection plate including a pair of drive elements spaced longitudinally on the ejection plate and pivoted thereto, and means forming a yielding connection in the power drive means with one of said drive elements whereby in the operation of the device the pouch is compressed by the ejection plate first at one end portion of the pouch and subsequently at the opposite end portion so that predetermined volumes of blood are expelled cyclically from the pouch at its end which is compressed last by the ejection plate.
Dependencies are inferred from the claim text.